<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
    <script>
        var zns={};
        zns.common={};
        zns.fx={};
        zns.site={};
        zns.common.getUser=function(){
            alert('a');
        };
        zns.fx.getUser=function(){
            alert('b');
        };
        zns.site.getUser=function(){
            alert('c');
        };
        zns.common.getUser();
        zns.fx.getUser();
        zns.site.getUser();
    </script>
</head>
<body>

</body>
</html>